It may have been fired accidentally by untrained personnel, who are trying to reclaim their own territory in the Donbas. Let's not forget why this war started and who is ultimately responsible for the half a million fatalities and five million internally displaced in Ukraine. https://www.theguardian.com/world/2023/sep/19/ukrainian-market-tragedy-may-have-been-caused-by-errant-missile-fired-by-ukraine
You are missing the forest for the trees, Steve. your bias against Russia and towards NATO prevents you from seeing NATO criminality and collusion even when it is in front of you, in flashing neon lights.
Ask yourself where the Guardian and NYT "investigations" were when the market was hit. Let's have a look shall we. I'm sure that the articles written in the immediate aftermath by the "Guardian" and "NYT" will be guarded in attributing blame in this "yet to be investigated" incident.
The Guardian first;
https://www.theguardian.com/world/2023/sep/06/russian-strike-on-crowded-ukraine-market-leaves-many-dead-blinken-visit The first paragraphs give the general flavour, Steve, copied below;
A Russian strike has hit a crowded market in the Ukrainian city of Kostiantynivka, killing at least 17 people, as the US secretary of state, Antony Blinken, was in Kyiv for an unannounced visit, his first for a year to the Ukrainian capital.
Ukrainian officials said a further 32 people were wounded in the attack, one of Russia’s deadliest attacks in months, 12 miles (20km) from the frontlines in the Donetsk region of eastern Ukraine.
Video of the aftermath showed fires raging in destroyed buildings and soldiers carrying body bags away from the scene. The Ukrainian prime minister, Denys Shmyhal, said a child was among those killed.
“A regular market. Shops. A pharmacy. People who did nothing wrong. Many wounded,” the Ukrainian president, Volodymyr Zelenskiy, wrote in a post on Telegram.
He called the strike “a terrorist attack” and said in a later press conference that it reflected the situation on the battlefield. “Whenever there are any positive advances by Ukrainian defence forces in that direction, Russians always target civilian people and civilian objects.”
Oh dear! Not very balanced reporting is it? What suddenly brought about their "investigation" after such opening certainty? Could it have been the fact that publicly available open source intel was widely disseminated which proved that the missile came from a direction which ruled out Russian culpability? The Guardian and NYT "investigations " are self evidently cover ups of an attempted false flag attack which they have to now explain away as no longer deliberate. That the missile hit the most population dense part of the city(ie. the market at busy period) is now a mere unfortunate coincidence. You would not believe this crock of shit if the roles were reversed and Russian media were reporting such inconsistent drivel.
In a nutshell, Steve, here is what happened in a few easy steps as your bias seems to be preventing you from seeing what is glaringly obvious.
1) NATO fire deliberately targeted missile at market in Kostiantynivka
2) All of western media report the attack as unquestionably, A "Russian strike has hit a crowded market in the Ukrainian city of Kostiantynivka, killing at least 17 people, as the US secretary of state, Antony Blinken, was in Kyiv for an unannounced visit, his first for a year to the Ukrainian capital."
3) The footage released inadvertently contained evidence that blew the Russian culpability narrative( there were attempts to remove the footage and new "cleaned up" footage was released, but the cat was out of the bag)
4) Houston we have a problem!!
5) Western media now have a deliberately targeted attack on civilians but need to somehow spin the facts because Russia, have been ruled out as the culprit. What to do?
6) "Respected papers of record"

the Guardian and NYT carry out "investigations".
7) The result of the
hastily and shoddily written MI5/6/CIA cover story Guardian and NYT "investigations" reassures us that the deaths are now an unfortunate accident which "may" have been caused bla bla...

All of the other attacks that have been reported with such certainty previously were still definitely done by the Russians though and require no further investigation.
Steve, they got caught in an attempted false flag that was debunked. The Guardian and NYT, as well as all other western MSM, have outed themselves as mere propagandists. The small time frame between setting up the false flag, having media sing off the same hymn sheet, and that narrative falling apart is small enough that the "reporting" of these paid propagandists is well and truly exposed. It is impossible not to see.
You cannot read their initial reporting and take seriously their new "investigation".